update travis yml for java 8, maybe?
update travis yml for java 8, maybe?

botandrose/eboshi_api_shootout,jkwatson/eboshi_api_shootout,botandrose/eboshi_api_shootout,jkwatson/eboshi_api_shootout,jkwatson/eboshi_api_shootout,jkwatson/eboshi_api_shootout,botandrose/eboshi_api_shootout,botandrose/eboshi_api_shootout,jkwatson/eboshi_api_shootout,botandrose/eboshi_api_shootout